Watch-glass cover for beakers



Dec. 10, 1929. s-ru ss 1,738,804

WATCH GLASS COVER FOR BEAKERS Filed June 22. 1928 flNVENTOR; 1mg kw A) MBY guy A TTORNEYA'.

lilac. id, 1929 Ubll l hw STATES mater KONSTANTIN STUESSER, OF NEWBRITAIN, CONNECTICUT WATCH-GLASS COVER FDR IBEAKEBS Application filedJune 22,

My invention relates to improvements in watch-glass covers tor beakersfor use in chemical laboratories in connection with boiling andevaporating operations or the like, the beaker-s being provided with apouring lip, and the object of my improvement is to produce awatclrglass or crystal cover for a beaker that is provided with a set ofribs that project from the bottom convex face so to be adapted to serveas seats for the cover in engagement with the rim of the beaker so thata space is provided above the said rim ior pern'iitting of relativelyfree evaporation, and which ribs, however, terminate by their outer endsin spaced relation to the edge of the cover so as to leave the outerborder portion, beyond the ribs unobstructed and tree tor use as a seatfor close contact with said rim, such seating being permissible bylocating one of the ribs in registration with the open space of thespout or pouring lip.

in the accompanying drawing Figure 1 is a side elevation of a watchglasscover for beakers in position on a beaker and with the ribs involved inmy invention serving as the seats for the cover.

i ure 2 is a plan view of the same, the locations oi. the ribs beingindicated by the indentations on the upper face of the cover.

Figure 3 is a bottom-face view of the cover, the position of the beaker"for close-covering being indicated by means of broken lines.

Figure 4 is a fragmentary sectional view showing the beaker lip and arib in registration therewith.

My improved watch-glass cover 10 for beaker-s 11 comprises tor thegeneral structure the usual form of bowed or curved crystal-like termthat is applied to the rim portion 12 ot the beaker 11 with the convexface 13 on the under side and adapted to be seated by the border portion14: on said rim portion 12.

in the present combination said bottom border rim portion 12 is utilizedfor the seating the cover for close covering, but in a special mannerbecause of the provision of the ribs on the under side to be described.

Said ribs 15, as shown, are three in number, distributed around the faceat one-hundred.

1928. Serial No. 287,603.

and twenty-degree intervals, and may be formed by suitably indenting thematerial 01' the cover, leaving grooves 16 on the upper concave face 17.

The said ribs 15 are of suiiicient thickness and are suitably positionedrelatively to the beaker rim 12 that they will serve as seats for thecover 10 for positioning the same in spaced relation to the rim 12,leaving the space 18 for the relatively free escape of vapor duringboiling of liquid in the beaker or the like. The ribs 15 thus dispensewith the need of glass hooks that are now in common use.

The ribs 15 may be spaced and located so as to permit the cover to bepositioned concentric with the axis of the beaker when in the ele vatedor open location.

In the close covering position the cover is located slightly eccentricrelatively to the beaker and the border face portion 1% beyond the ribs15 is used for the seating.

Said bottom border portion 14: is free and unobstructed, the ribs 15 bytheir outer ends 19 terminating the proper distance inwardly from theextreme outer edge 20 of the cover.

My cover is specifically adapted for cooperation with a beaker 11 thathas a pouring lip 21 that projects outwardly in the usual manner beyondthe side wall 22 and that on the inside has the open space 23 throughwhich the liquid is poured.

Said open space 23 serves as an interruption of the rim structure 12 andthis is utilized for housing one of the ribs 15 in the close position ofthe cover.

Said trough-space 23 also permits of the slight shifting of the coveraway from the concentric position for permitting of the seatinggenerally of the cover 10 by the bottom border portion 14 on the portionof the rim 12 that comprises substantially all except the relativelysmall portion at or adjacent the rim 21.

As described, by a slight shitting of the cover either a close cover fitmay be eiifected or a relatively open condition may be provided.

I claim as my invention A watch-glass cover for beakers comprising astructure having a contacting face for seating upon the rim portion ot abeaker and provided with a set of generally radially directed ribs forseating in spaced relation to said rim portion, said ribs terminating bytheir outer ends so that said contacting face is'unobstructed thereby,and the parts being constructed and arranged so that with a V beakerthat. is provided with a pouring lip, by positioning one of: said ribsWithin the pouring trough provided by said lip the cover may be shiftedso as to change the seating of the cover from said ribs to saidcontacting face.

' KONSTANTIN STUESSER.

